Elevator



(No Model.)

B. BUTTERWORTH.

ELEVATOR.

No. 441,824. Patented Dec. 2, 1890.

Yi*H555Iiiiiiliiiilliiiilliii UNITED STATES PATENT ()FFICE.

H ROBERT BUTTERWVORTH, OF SOMERVILLE, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 441,824, dated December2, 1890.

Application filed July 14,1890. Serial No. 358,637. (No model.)

To all whom it may concern.-

Be it known that 1, ROBERT BUTTERWORTH, of Somerville, in the county ofMiddlesex, State of Massachusetts, have invented certain new and usefulImprovements in Elevators, of which the following is a descriptionsufficiently full, clear, and exact to enable any person skilled in theart or science to which said invention appertains to make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification, in which- Figure 1 is a sectional front elevationshowing an elevator-car provided with my improvement; Fig. 2, a sideelevation of the same; Fig. 3, a sectional elevation, enlarged, showingthe gate-locking mechanism; and Figs. at and 5, elevations illustratingcertain details of construction.

Like letters of reference indicate corresponding parts in the differentfigures of the drawings.

My invention relates especially to a device for locking the sliding gateof freight-elevator Wells when opened; and it consists in certain novelfeatures, hereinafter fully set forth and claimed, the object being toproduce a simpler, cheaper, and more effective device of this characterthan is now in ordinary use.

The nature and operation of the improvement will be readily understoodby all conversant with such matters from the following explanation.

In the drawings, A represents the well, and B the car considered as awhole.

The car is of the ordinary form of platform cars used. infreight-elevators, and consists of a flooring 1), two Vertical standards(1, connected by a crossbar f at the top, to which a lifting'rope isattached in the usual manner.

A gate 0, of ordinary construction, is fitted to slide vertically ontracks h on the side beams t' of the well. A cord k, secured to thegate, passes over a pulley m in the casing, and is provided on its outerend with a balance-weight p. The gate-track 71 is so arranged that itsupper portion is nearer the inner edge of the studding 2' than its lowerportion, said track being bent or curved inward at j. On the inner faceof the gate a stiff fiat spring q is secured. To one of the standards (1of the car a bracket 9* is secured, and projects laterally in positionto engage the free end of said spring, the outer face 15 of the bracketbeing corrugated or indented, as shown in Figs. 4 and 5, to prevent itslipping too readily on the head of said spring. Instead of saidcorrugations or indentations, the face of said bracket may be coveredwith rubber, wood, or similar material.

In the use of my improvement the gate, being elevated in the ordinarymanner, passes over the curved port-ions j, of the bracket h, and isdrawn inward toward the car, as best shown in Fig. 3. The car arrivingat the landing, the spring q, engaging the face of the bracket 0,sustains said gate in its elevated position. As soon as the carleavesthe landing and the bracket 0" becomes disengaged from the spring q, thegate falls by its own weight into its normal position, passing over thecurved portion j of the track, and outward onto the lower portionthereof, in which position the spring q is withdrawn from the wellsufficiently so that a car passing the landing will not engage it.

Having thus explained my invention, what I claim is- 1. In a device ofthe character described, a well-gate fitted to slide on tracksvertically offset toward said well, and provided with a spring on itsinner face, in combination with a car provided with an arm or projectionhaving a roughened or serrated surface adapted to engage the gateprojection and support said gate when opened or elevated, substan-ROBERT BUT'IERWORTH.

Witnesses:

O. M. SHAW, K. DURFEE.

